public class Test1 {
    public static void main(String[] args) {
        //int arr[][]={{4,6},{1,4,5,7},{-2}};遍历该二维数组,并得到和
        int arr[][]={{4,6},{1,4,5,7},{-2}};
        int sum=0;
        for(int i = 0; i < arr.length;i++){
            for(int j = 0; j < arr[i].length;j++){
                sum+=arr[i][j];
                System.out.print(arr[i][j]+" ");
            }
            System.out.println();
        }
        System.out.println("和为"+sum);
    }
}
